netdev - RE: Kernel Performance Tuning for High Volume SCTP traffic

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DD00950DD@AcuExch.aculab.com>
Date:   Fri, 13 Oct 2017 16:35:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Traiano Welcome' <traiano@...il.com>
CC:     "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Kernel Performance Tuning for High Volume SCTP traffic

From: Traiano Welcome
> Sent: 13 October 2017 17:04
> On Fri, Oct 13, 2017 at 11:56 PM, David Laight <David.Laight@...lab.com> wrote:
> > From: Traiano Welcome
> >
> > (copied to netdev)
> >> Sent: 13 October 2017 07:16
> >> To: linux-sctp@...r.kernel.org
> >> Subject: Kernel Performance Tuning for High Volume SCTP traffic
> >>
> >> Hi List
> >>
> >> I'm running a linux server processing high volumes of SCTP traffic and
> >> am seeing large numbers of packet overruns (ifconfig output).
> >
> > I'd guess that overruns indicate that the ethernet MAC is failing to
> > copy the receive frames into kernel memory.
> > It is probably running out of receive buffers, but might be
> > suffering from a lack of bus bandwidth.
> > MAC drivers usually discard receive frames if they can't get
> > a replacement buffer - so you shouldn't run out of rx buffers.
> >
> > This means the errors are probably below SCTP - so changing SCTP parameters
> > is unlikely to help.
> 
> Does this mean that tuning UDP performance could help ? Or do you mean
> hardware (NIC) performance could be the issue?

I'd certainly check UDP performance.

	David